A graphic adventure in 4 parts from Thriller Picture Library #436, December 1962 - 64 pages. Reprinted in Secret Agent Picture Library Holiday Special 1968.
Parachuting into occupied France to join up with a resistance band, David Doughty, Spy 13, has unfortunate news for them: there is a traitor among their ranks and he has "proof of the treachery ... if not the actual traitor". This will complicate the overall plan to break into the well protected St. Pierre Prison to free patriots held there.